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<h1>Numerical issues</h1>
<p>Because the expressions are evaluated using double precision floating point 
numbers, roundoff errors will inevitably affect calculations. This is especially 
true when the function's argument takes extreme values.</p>
<p><i>Example:</i><br>
Since the value of <code><a href="reference_pi.htm">pi</a></code> on a computer 
can only be an approximation of <code>pi</code>, <code>
<a href="reference_tan.htm">tan</a>(pi/2)</code> is not undefined, but returns a 
very large number.</p>

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